Characterization and Efficacy Studies of Activated Charcoal Produced from Animal Bones for Heavy Metal Adsorption from Waste Water Using Concentrated Hydrochloric Acid as Activating Agent
DOI:
https://doi.org/10.56919/usci.2434.035Keywords:
Activated Charcoal, Animal Bones, Adsorption, Hydrochloric Acid, Heavy MetalsAbstract
This research work is designed to study and analyse the efficacy and also characterization of the activated charcoal produced from cow, sheep, and goat bones using concentrated hydrochloric acid as an activating agent for toxic metals adsorption using chromatographic techniques. This research aims to provide an eco-friendly adsorbent that will also reduce environmental waste from being converted to activated charcoal. The bones undergo carbonization with the aid of a furnace for one hour (1hr) at 600°C. The bone charcoal was activated with concentrated hydrochloric acid for a period of 4 hrs at a ratio of 10.0 ml per 50.0 g. The activated bone charcoals produced were characterized using scanning electron microscope (SEM) and infrared spectroscopy (FT-IR) before and after adsorption; the results obtained from SEM show the porosity owing to the breakage in the surface of the adsorbents before adsorption while after adsorption the porosity reduces for both adsorbents. The FT-IR results indicated the existence of functional groups OH, C-H, C=O, and PO43- with some changes in the vibration frequency before and after adsorption. Column adsorption shows that the percentage adsorption for both metals increases with an increase in initial metal concentrations. As the concentration of Lead increased from 20, 30 to 40ppm, there was a corresponding swift increase in adsorption from 46.2 %, 61.58 % to 71.13 % for ACBC (Activated Cow Bone Charcoal) and increase from 25.13 %, 35.65 % to57.70 % for ASBC. For Copper, there was increased in adsorption from 37.30 %, 55.90 % to 64.53 % for ACBC, 39.10 %, 56.55 % to 64.90% for ASBC (Activated Sheep Bone Charcoal), for Zinc there was an increase from 35.60%, and 56.45% to 67.03% and similarly for Iron 16.60%, 45.03% to 58.53% for ACBC. The equilibrium data for ASBC-Pb, ACBC-Fe, and ASBC-Fe with a high regression coefficient value (R2) of 0.999 each fit well with the Langmuir isotherm model. For ACBC-Pb, ACBC-Cu, ASBC-Cu, ACBC-Zn, and ACBC-Zn with high regression coefficient values (R2), 0.999, 1.0, 0.999, 0.999, and 1.0, respectively, fit well to the Freundlich isotherm model. Therefore, the adsorption occurs through multilayer formation on the adsorbent surfaces. The indices of the separation factor KL for Langmuir indicate that the adsorption processes are favourable, with the exception of ASBC-Fe, which is unfavourable. The Fruendlich isotherm constant nf for the adsorption of ACBC-Pb, ACBC-Cu, ASBC-Cu, ACBC-Zn, and ASBC-Zn displays adsorption on heterogeneous surfaces. This uncovers that bone charcoals can be used for the removal of heavy metals by adsorption from aqueous media and can serve as an efficient adsorbent for water purification and treatments in industries.
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